(!!!) 6EA7 Tungsol NOS 1960's (1.8ma/64ma) (strong single)
(!!) 6EA7=6EM7 Sylvania coin-base NOS 1970's (1.8/53.6ma)
(!!) 6EA7 Sylvania NOS 1960 era (2.1/43ma)
(!!!!) (Best Pair) 6EA7 RCA black plates NOS 1964 (2.4/40.4ma and 2.4/36ma)
(!!) 6EM7 Sylvania NOS 1960 era (1.5/55ma)
(!!) (Best Single) 6EM7 RCA black plates NOS 1969 (2.9ma and 53ma)
6EA7 GE black base rebranded Zenith 1960 used/good (3.6ma/35ma)
6EA7 GE NOS 1965 (2.4ma/57.5ma)
(!) (BEST SINGLE) 6EM7 RCA coin-base black plates NOS 1970's (2.4ma and 57ma)
6EM7 RCA coin-base black plates NOS 1970's broken guide pin (2.4ma/50ma)
6EM7 RCA coin-base black plates used/good 1970's (2.6ma/63ma)
6EM7 RCA coin-base used (2.5ma/28ma)
6EM7 Sylvania NOS 1970 (1.5ma/47ma)
6EM7 RCA black plates NOS 1965 (1.2ma and 30ma)
6EM7 Sylvania NOS 1960's (1.7ma/75ma)
6EM7 RCA NOS 1965 (4.2ma/31ma)
6EM7 GE Amperex NOS 1970's (2.4ma/34ma)
6EM7 GE Canada NOS 1960's (2.9ma/30ma)
6EM7 Sylvania Silvertone NOS 1960's (1.5ma/55ma)
(!!!) (Recommended Pair) 6EM7=6EA7 Sylvania coin-base NOS 1970's (1.5ma/73ma and 1.8ma/65ma)
